Field-induced insulator-metal-insulator transitions in low-energy H-2(+) ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films

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	Field-induced insulator-metal-insulator transitions in low-energy H-2(+) ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films
	Wu, ZW ; Li, J ; Li, SL ; Zheng, DN
刊名	CHINESE PHYSICS B
	2013
卷号	22 期号:8
关键词	manganite ion irradiation magnetoresistance
ISSN号	1674-1056
通讯作者	Wu, ZW (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	Epitaxial La2/3Ca1/3MnO3 thin films grown on LaAlO3 (001) substrates were irradiated with low-energy 120-keV H-2(+) ions over doses ranging from 10(12) ions/cm(2) to 10(17) ions/cm(2). The irradiation suppresses the intrinsic insulator-metal (I-M) transition temperature and increases the resistance by reducing the crystallographic symmetry of the films. No irradiation-induced columnar defects were observed in any of the samples. The specific film irradiated at a critical dose around 8 x 10(15) ions/cm(2) is in a threshold state of the electric insulator where the I-M transition is absent. In an external field of 4 T or higher, the I-M transition is restored and thus an enormous magnetoresistance is observed, while a negative temperature coefficient resumes as the temperature is reduced further. Magnetic relaxation behavior is confirmed in this and other heavily irradiated samples. The results are interpreted in terms of the displacement of oxygen atoms provoked by ion irradiation and the resulting magnetic glassy state, which can be driven into a phase coexistence of metallic ferromagnetic droplets and the insulating glass matrix in a magnetic field.
资助信息	National Basic Research Program of China [2011CBA00106]; National Natural Science Foundation of China [11174342, 11161130519, 11104333]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/57019]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wu, ZW,Li, J,Li, SL,et al. Field-induced insulator-metal-insulator transitions in low-energy H-2(+) ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films[J]. CHINESE PHYSICS B,2013,22(8).
APA	Wu, ZW,Li, J,Li, SL,&Zheng, DN.(2013).Field-induced insulator-metal-insulator transitions in low-energy H-2(+) ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films.CHINESE PHYSICS B,22(8).
MLA	Wu, ZW,et al."Field-induced insulator-metal-insulator transitions in low-energy H-2(+) ion-irradiated epitaxial La2/3Ca1/3MnO3 thin films".CHINESE PHYSICS B 22.8(2013).